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Coupling of localized moments and itinerant electrons in EuFe2As2 single crystals studied by Electron Spin Resonance

Electron spin resonance measurements in EuFe2As2 single crystals revealed an absorption spectrum of a single resonance with Dysonian lineshape. Above the spin-density wave transition at T_SDW = 190 K the spectra are isotropic and the spin relaxation is strongly coupled to the CEs resulting in a Korringa-like increase of the linewidth. Below T_SDW, a distinct anisotropy develops and the relaxation behavior of the Eu spins changes drastically into one with characteristic properties of a magnetic insulating system, where dipolar and crystal-field interactions dominate. This indicates a spatial confinement of the conduction electrons to the FeAs layers in the SDW state.

preprint2009arXivOpen access
E. DenglerJ. DeisenhoferH. -A. Krug von NiddaSeunghyun KhimJ. S. KimKee Hoon KimF. CasperC. FelserA. Loidl
cond-mat.supr-con
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E. DenglerJ. DeisenhoferH. -A. Krug von NiddaSeunghyun KhimJ. S. KimKee Hoon KimF. CasperC. FelserA. Loidl

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